Mobile device and optical imaging lens thereof

ABSTRACT

Present embodiments provide for a mobile device and an optical imaging lens thereof. The optical imaging lens comprises five lens elements positioned sequentially from an object side to an image side. Through controlling the convex or concave shape of the surfaces and/or the refracting power of the lens elements, the optical imaging lens shows better optical characteristics and the total length of the optical imaging lens is shortened.

INCORPORATION BY REFERENCE

This application claims priority from P.R.C. Patent Application No.201310088679.X, filed on Mar. 19, 2013, the contents of which are herebyincorporated by reference in their entirety for all purposes.

TECHNICAL FIELD

The present invention relates to a mobile device and an optical imaginglens thereof, and particularly, relates to a mobile device applying anoptical imaging lens having five lens elements and an optical imaginglens thereof.

BACKGROUND

The ever-increasing demand for smaller sized mobile devices, such ascell phones, digital cameras, etc. correspondingly triggered a growingneed for a smaller sized photography module, comprising elements such asan optical imaging lens, a module housing unit, and an image sensor,etc., contained therein. Size reductions may be contributed from variousaspects of the mobile devices, which includes not only the chargecoupled device (CCD) and the complementary metal-oxide semiconductor(CMOS), but also the optical imaging lens mounted therein. When reducingthe size of the optical imaging lens, however, achieveing good opticalcharacteristics becomes a challenging problem.

U.S. Pat. No. 8,189,273, U.S. Pat. No. 7,911,711, R.O.C. Patent No.M368072 and Japan Patent Publication No. 2010256608 all disclosed anoptical imaging lens constructed with an optical imaging lens havingfive lens elements, wherein the distance between a first lens elementand an image plane is too long for smaller sized mobile devices.

Therefore, there is needed to develop optical imaging lens with ashorter length, while also having good optical characters.

SUMMARY

An object of the present invention is to provide a mobile device and anoptical imaging lens thereof. With controlling the convex or concaveshape of the surfaces and/or the refracting power of the lens elements,the length of the optical imaging lens is shortened and meanwhile thegood optical characters, and system functionality are sustained.

In an exemplary embodiment, an optical imaging lens comprises,sequencially from an object side to an image side along an optical axis,comprises an aperture stop, first, second, third, fourth and fifth lenselements, each of the first, second, third, fourth and fifth lenselements having an object-side surface facing toward the object side andan image-side surface facing toward the image side, wherein: the firstlens element has positive refracting power, and the image-side surfacethereof comprises a convex portion in a vicinity of a periphery of thefirst lens element; the object-side surface of the second lens elementcomprises a concave portion in a vicinity of a periphery of the secondlens element; the third lens element has positive refracting power, andthe object-side surface of the third lens element comprises a concaveportion in a vicinity of the optical axis, and the image-side surface ofthe third lens element is a convex surface; the object-side surface ofthe fourth lens element comprises a concave portion in a vicinity of aperiphery of the fourth lens element; the fifth lens element isconstructed by plastic material, the object-side surface of the fifthlens element comprises a convex portion in a vicinity of the opticalaxis; and the optical imaging lens as a whole comprises only the fivelens elements having refracting power.

In another exemplary embodiment, some equation (s), such as thoserelating to the ratio among parameters could be taken intoconsideration. For example, the sum of the thickness of all five lenselements along the optical axis, ALT, and a central thickness of thethird lens element along the optical axis, CT3, could be controlled tosatisfy the equation as follows:

ALT/CT3≦5.10  Equation (1); or

An air gap between the first lens element and the second lens elementalong the optical axis, AC12, and the sum of all four air gaps from thefirst lens element to the fifth lens element along the optical axis,AAG, could be controlled to satisfy the equation (s) as follows:

AAG/AC12≦6.00  Equation (2); or

AAG/AC12≦3.00  Equation (2′); or

A central thickness of the first lens element along the optical axis,CT1, and a central thickness of the second lens element along theoptical axis, CT2, could be controlled to satisfy the equation asfollows:

CT1/CT2≦2.00  Equation (3); or

CT2 and a central thickness of the fifth lens element along the opticalaxis, CT5, could be controlled to satisfy the equation as follows:

CT5/CT2≦1.50  Equation (4); or

ALT and a central thickness of the fourth lens element along the opticalaxis, CT4, could be controlled to satisfy the equation as follows:

5.20≦ALT/CT4  Equation (5); or

ALT, AAG and CT5 could be controlled to satisfy the equation as follows:

7.00≦(ALT+AAG)/CT5  Equation (6); or

ALT, CT4 and CT5 could be controlled to satisfy the equation as follows:

3.10≦ALT/(CT4+CT5)  Equation (7); or

AAG, an air gap between the second lens element and the third lenselement along the optical axis, AC23, an air gap between the third lenselement and the fourth lens element along the optical axis, AC34, and anair gap between the fourth lens element and the fifth lens element alongthe optical axis, AC45, could be controlled to satisfy the equation asfollows:

1.50≦AAG/(AC23+AC34+AC45)  Equation (8); or

ALT and CT1 could be controlled to satisfy the equation as follows:

4.20≦ALT/CT1  Equation (9); or

AC12, AC23, AC34 and AC45 could be controlled to satisfy the equation asfollows:

1.00≦AC12/(AC23+AC34+AC45)  Equation (10); or

ALT, AAG and CT3 could be controlled to satisfy the equation as follows:

(ALT+AAG)/CT3≦3.40  Equation (11).

Aforesaid exemplary embodiments are not limited and could be selectivelyincorporated in other embodiments described herein.

In some exemplary embodiments, more details about the convex or concavesurface structure or the refracting power of the lens element(s) couldbe incorporated for one specific lens element or broadly for plural lenselements to enhance the control for the system performance and/orresolution. For example, the image-side surface of the first lenselement further comprises a concave portion in a vicinity of the opticalaxis, etc. It is noted that the details listed here could beincorporated in example embodiments if no inconsistency occurs.

In another exemplary embodiment, a mobile device comprising a housingand a photography module positioned in the housing is provided. Thephotography module comprises any of aforesaid example embodiments ofoptical imaging lens, a lens barrel, a module housing unit and an imagesensor. The lens barrel is for positioning the optical imaging lens, themodule housing unit is for positioning the lens barrel, the substrate isfor positioning the module housing unit; and the image sensor ispositioned at the image side of the optical imaging lens.

In some exemplary embodiments, the module housing unit optionallycomprises a lens backseat. The lens backseat exemplarily comprises afirst lens backseat and a second lens backseat, the first lens backseatis positioned close to the outside of the lens barrel and along with anaxis for driving the lens barrel and the optical imaging lens positionedtherein to move along the axis, and the second lens backseat ispositioned along the axis and around the outside of the first lensbackseat. The module housing unit may optionally further comprise animage sensor base positioned between the second lens backseat and theimage sensor, and the image sensor base is closed to the second lensbackseat.

Through controlling the convex or concave shape of the surfaces and/orthe refraction power of the lens element(s), the mobile device and theoptical imaging lens thereof in exemplary embodiments achieve goodoptical characters and effectively shorten the length of the opticalimaging lens.

BRIEF DESCRIPTION OF THE DRAWINGS

Exemplary embodiments will be more readily understood from the followingdetailed description when read in conjunction with the appended drawing,in which:

FIG. 1 is a cross-sectional view of one single lens element according tothe present disclosure;

FIG. 2 is a cross-sectional view of a first embodiment of an opticalimaging lens having five lens elements according to the presentdisclosure;

FIG. 3 is a chart of longitudinal spherical aberration and other kindsof optical aberrations of a first embodiment of the optical imaging lensaccording to the present disclosure;

FIG. 4 is a table of optical data for each lens element of a firstembodiment of an optical imaging lens according to the presentdisclosure;

FIG. 5 is a table of aspherical data of a first embodiment of theoptical imaging lens according to the present disclosure;

FIG. 6 is a cross-sectional view of a second embodiment of an opticalimaging lens having five lens elements according to the presentdisclosure;

FIG. 7 is a chart of longitudinal spherical aberration and other kindsof optical aberrations of a second embodiment of the optical imaginglens according to the present disclosure;

FIG. 8 is a table of optical data for each lens element of the opticalimaging lens of a second embodiment of the present disclosure;

FIG. 9 is a table of aspherical data of a second embodiment of theoptical imaging lens according to the present disclosure;

FIG. 10 is a cross-sectional view of a third embodiment of an opticalimaging lens having five lens elements according to the presentdisclosure;

FIG. 11 is a chart of longitudinal spherical aberration and other kindsof optical aberrations of a third embodiment of the optical imaging lensaccording the present disclosure;

FIG. 12 is a table of optical data for each lens element of the opticalimaging lens of a third embodiment of the present disclosure;

FIG. 13 is a table of aspherical data of a third embodiment of theoptical imaging lens according to the present disclosure;

FIG. 14 is a cross-sectional view of a fourth embodiment of an opticalimaging lens having five lens elements according to the presentdisclosure;

FIG. 15 is a chart of longitudinal spherical aberration and other kindsof optical aberrations of a fourth embodiment of the optical imaginglens according the present disclosure;

FIG. 16 is a table of optical data for each lens element of the opticalimaging lens of a fourth embodiment of the present disclosure;

FIG. 17 is a table of aspherical data of a fourth embodiment of theoptical imaging lens according to the present disclosure;

FIG. 18 is a cross-sectional view of a fifth embodiment of an opticalimaging lens having five lens elements according to the presentdisclosure;

FIG. 19 is a chart of longitudinal spherical aberration and other kindsof optical aberrations of a fifth embodiment of the optical imaging lensaccording the present disclosure;

FIG. 20 is a table of optical data for each lens element of the opticalimaging lens of a fifth embodiment of the present disclosure;

FIG. 21 is a table of aspherical data of a fifth embodiment of theoptical imaging lens according to the present disclosure;

FIG. 22 is a cross-sectional view of a sixth embodiment of an opticalimaging lens having five lens elements according to the presentdisclosure;

FIG. 23 is a chart of longitudinal spherical aberration and other kindsof optical aberrations of a sixth embodiment of the optical imaging lensaccording the present disclosure;

FIG. 24 is a table of optical data for each lens element of the opticalimaging lens of a sixth embodiment of the present disclosure;

FIG. 25 is a table of aspherical data of a sixth embodiment of theoptical imaging lens according to the present disclosure;

FIG. 26 is a cross-sectional view of a seventh embodiment of an opticalimaging lens having five lens elements according to the presentdisclosure;

FIG. 27 is a chart of longitudinal spherical aberration and other kindsof optical aberrations of a seventh embodiment of the optical imaginglens according the present disclosure;

FIG. 28 is a table of optical data for each lens element of the opticalimaging lens of a seventh embodiment of the present disclosure;

FIG. 29 is a table of aspherical data of a seventh embodiment of theoptical imaging lens according to the present disclosure;

FIG. 30 is a table for the values of ALT/CT3, AAG/AC12, CT1/CT2,CT5/CT2, ALT/CT4, (ALT+AAG)/CT5, ALT/(CT4+CT5), AAG/(AC23+AC34+AC45),ALT/CT1, AC12/(AC23+AC34+AC45) and (ALT+AAG)/CT3 of all seven exampleembodiments;

FIG. 31 is a structure of an example embodiment of a mobile device;

FIG. 32 is a partially enlarged view of the structure of another exampleembodiment of a mobile device.

DETAILED DESCRIPTION

For a more complete understanding of the present disclosure and itsadvantages, reference is now made to the following description taken inconjunction with the accompanying drawings, in which like referencenumbers indicate like features. Persons having ordinary skill in the artwill understand other varieties for implementing example embodiments,including those described herein. The drawings are not limited tospecific scale and similar reference numbers are used for representingsimilar elements. As used in the disclosures and the appended claims,the terms “example embodiment,” “exemplary embodiment,” and “presentembodiment” do not necessarily refer to a single embodiment, although itmay, and various example embodiments may be readily combined andinterchanged, without departing from the scope or spirit of the presentinvention. Furthermore, the terminology as used herein is for thepurpose of describing example embodiments only and is not intended to bea limitation of the invention. In this respect, as used herein, the term“in” may include “in” and “on”, and the terms “a”, “an” and “the” mayinclude singular and plural references. Furthermore, as used herein, theterm “by” may also mean “from”, depending on the context. Furthermore,as used herein, the term “if” may also mean “when” or “upon”, dependingon the context. Furthermore, as used herein, the words “and/or” mayrefer to and encompass any and all possible combinations of one or moreof the associated listed items.

Here in the present specification, “a lens element having positiverefracting power (or negative refracting power)” means that the lenselement has positive refracting power (or negative refracting power) inthe vicinity of the optical axis. “An object-side (or image-side)surface of a lens element comprises a convex (or concave) portion in aspecific region” means that the object-side (or image-side) surface ofthe lens element “protrudes outwardly (or depresses inwardly)” along thedirection parallel to the optical axis at the specific region, comparedwith the outer region radially adjacent to the specific region. TakingFIG. 1 for example, the lens element shown therein is radially symmetricaround the optical axis which is labeled by I. The object-side surfaceof the lens element comprises a convex portion at region A, a concaveportion at region B, and another convex portion at region C. This isbecause compared with the outer region radially adjacent to the region A(i.e. region B), the object-side surface protrudes outwardly at theregion A, compared with the region C, the object-side surface depressesinwardly at the region B, and compared with the region E, theobject-side surface protrudes outwardly at the region C. Here, “in avicinity of a periphery of a lens element” means that in a vicinity ofthe peripheral region of a surface for passing imaging light on the lenselement, i.e. the region C as shown in FIG. 1. The imaging lightcomprises chief ray Lc and marginal ray Lm. “In a vicinity of theoptical axis” means that in a vicinity of the optical axis of a surfacefor passing the imaging light on the lens element, i.e. the region A asshown in FIG. 1. Further, a lens element could comprise an extendingportion E for mounting the lens element in an optical imaging lens.Ideally, the imaging light would not pass the extending portion E. Herethe extending portion E is only for example, the structure and shapethereof are not limited to this specific example. Please also noted thatthe extending portion of all the lens elements in the exampleembodiments shown below are skipped for maintaining the drawings cleanand concise.

Example embodiments of an optical imaging lens may comprise an aperturestop, a first lens element, a second lens element, a third lens element,a fourth lens element and a fifth lens element, each of the lenselements comprises an object-side surface facing toward an object sideand an image-side surface facing toward an image side. These lenselements may be arranged sequencially from the object side to the imageside along an optical axis, and example embodiments of the lens as awhole may comprise only the five lens elements having refracting power.In an example embodiment: the first lens element has positive refractingpower, and the image-side surface thereof comprises a convex portion ina vicinity of a periphery of the first lens element; the object-sidesurface of the second lens element comprises a concave portion in avicinity of a periphery of the second lens element; the third lenselement has positive refracting power, and the object-side surface ofthe third lens element comprises a concave portion in a vicinity of theoptical axis, and the image-side surface of the third lens element is aconvex surface; the object-side surface of the fourth lens elementcomprises a concave portion in a vicinity of a periphery of the fourthlens element; and the fifth lens element is constructed by plasticmaterial, the object-side surface of the fifth lens element comprises aconvex portion in a vicinity of the optical axis.

Preferably, the lens elements are designed in light of the opticalcharacteristics and the length of the optical imaging lens. For example,combining the aperture stop positioned before the first lens elementwith the first lens element having positive refracting power, lightconverge ability of the optical imaging lens could be promoted toshorten the length thereof and depress the angle of the chief ray (theincident angle of the light onto the image sensor) at the periphery ofthe image sensor for a better sensitivity. The third lens element havingpositive refracting power shares the burden of the positive refractingpower required in the optical imaging lens with the first lens element.Thus, the production sensitivity of the first lens element may bedeclined. All the details at the periphery of the lens elements, such asthe convex portion in a vicinity of a periphery of the first lenselement on the image-side surface thereof, the convex portion in avicinity of a periphery of the third lens element on the image-sidesurface thereof, the concave portion in a vicinity of a periphery of thesecond lens element on the object-side surface thereof and the concaveportion in a vicinity of a periphery of the fourth lens element on theobject-side surface thereof, could assist in eliminating the aberrationof the optical imaging lens. Additionally, all these details couldpromote the image quality of the whole system.

In another exemplary embodiment, some equation (s) of parameters, suchas those relating to the ratio among parameters could be taken intoconsideration. For example, the sum of the thickness of all five lenselements along the optical axis, ALT, and a central thickness of thethird lens element along the optical axis, CT3, could be controlled tosatisfy the equation as follows:

ALT/CT3≦5.10  Equation (1); or

An air gap between the first lens element and the second lens elementalong the optical axis, AC12, and the sum of all four air gaps from thefirst lens element to the fifth lens element along the optical axis,AAG, could be controlled to satisfy the equation (s) as follows:

AAG/AC12≦6.00  Equation (2); or

AAG/AC12≦3.00  Equation (2′); or

A central thickness of the first lens element along the optical axis,CT1, and a central thickness of the second lens element along theoptical axis, CT2, could be controlled to satisfy the equation asfollows:

CT1/CT2≦2.00  Equation (3); or

CT2 and a central thickness of the fifth lens element along the opticalaxis, CT5, could be controlled to satisfy the equation as follows:

CT5/CT2≦1.50  Equation (4); or

ALT and a central thickness of the fourth lens element along the opticalaxis, CT4, could be controlled to satisfy the equation as follows:

5.20≦ALT/CT4  Equation (5); or

ALT, AAG and CT5 could be controlled to satisfy the equation as follows:

7.00≦(ALT+AAG)/CT5  Equation (6); or

ALT, CT4 and CT5 could be controlled to satisfy the equation as follows:

3.10≦ALT/(CT4+CT5)  Equation (7); or

AAG, an air gap between the second lens element and the third lenselement along the optical axis, AC23, an air gap between the third lenselement and the fourth lens element along the optical axis, AC34, and anair gap between the fourth lens element and the fifth lens element alongthe optical axis, AC45, could be controlled to satisfy the equation asfollows:

1.50≦AAG/(AC23+AC34+AC45)  Equation (8); or

ALT and CT1 could be controlled to satisfy the equation as follows:

4.20≦ALT/CT1  Equation (9); or

AC12, AC23, AC34 and AC45 could be controlled to satisfy the equation asfollows:

1.00≦AC12/(AC23+AC34+AC45)  Equation (10); or

ALT, AAG and CT3 could be controlled to satisfy the equation as follows:

(ALT+AAG)/CT3≦3.40  Equation (11).

Aforesaid exemplary embodiments are not limited and could be selectivelyincorporated in other embodiments described herein.

Reference is now made to Equation (1). The value of ALT/CT3 ispreferably smaller than or equal to 5.10 to satisfy Equation (1). Thisis because satisfying Equation (1) reflects that CT3, ALT as well as thelength of the optical imaging lens are shortened properly, given thatthe thickness of the third lens element having positive refractingpower, CT3, is usually required for a great value to assist in providinglight coverage ability. Additionally, the value of ALT/CT3 is suggestedfor a lower limit, such as 2.00≦ALT/CT3≦5.10.

Reference is now made to Equations (2) and (2′). The value of AAG/AC12is preferable less than or equal to 6.00 to satisfy Equation (2) or evenless than or equal to 3.00 to satisfy Equation (2′). This is becauseshortening AAG/AC12, the sum of all air gaps would be shortened and thisassists in shortening the length of the optical imaging lens. SatisfyingEquation (2) reflects that AC12, AAG as well as the length of theoptical imaging lens are shortened properly. Additionally, the value ofAAG/AC12 is suggested for a lower limit, such as 1.00≦AAG/AC12≦6.00.

Reference is now made to Equation (3). The value of CT1/CT2 ispreferable less than or equal to 2.00 to satisfy Equation (3). This isbecause the thickness of the first lens element having positiverefracting power which is relative thicker than that of the second lenselement should be restrained in a proper range. This makes limiting thevalue of CT1/CT2 proper for shortening the length of the optical imaginglens. Satisfying Equation (3) reflects that CT1 as well as the length ofthe optical imaging lens are shortened properly. Additionally, the valueof CT1/CT2 is suggested for a lower limit, such as 1.00≦CT1/CT2≦2.00.

Reference is now made to Equations (4). The value of CT5/CT2 ispreferable less than or equal to 1.50 to satisfy Equation (4). This isbecause the manufacturing difficulty of the fifth lens element having agreater surface area for passing light than other lens elements would bedeclined if CT5 is greater. Satisfying Equation (4) reflects that CT5 islimited to a proper range to prevent from a lengthy optical imaginglens. Additionally, the value of CT5/CT2 is suggested for a lower limit,such as 0.70≦CT5/CT2≦1.50.

Reference is now made to Equation (5). The value of ALT/CT4 ispreferable greater than or equal to 5.20 to satisfy Equation (5). Thisis because limitation for the thickness of the fourth lens element isrelatively looser than that of all other lens elements. For example, thefirst or third lens element require for a thicker thickness to providepositive refracting power and fifth lens element requires for greatersurface area for passing light. Therefore, controlling ALT/CT4 iseffective for reflecting how the thickness of the optical imaging lensas well as the thickness of the fourth lens element are shortened. WhenEquation (5) is satisfied, T4 is shortened properly. Additionally, thevalue of ALT/CT4 is suggested for an upper limit, such as5.20≦ALT/CT4≦8.80.

Reference is now made to Equation (6). The value of (ALT+AAG)/CT5 ispreferable greater than or equal to 7.00 to satisfy Equation (6). Thisis because a thinner thickness of the fifth lens element having arelative greater surface area for passing light among all other lenselement is benefit to shorten the length of the optical imaging lens.Therefore, controlling (ALT+AAG)/CT5 is effective for reflecting how thethickness of the optical imaging lens as well as the thickness of thefifth lens element are shortened. When Equation (6) is satisfied, T5 isshortened properly. Additionally, the value of (ALT+AAG)/CT5 issuggested for an upper limit, such as 7.00≦(ALT+AAG)/CT5≦9.50.

Reference is now made to Equation (7). The value of ALT/(CT4+CT5) ispreferable greater than or equal to 3.10 to satisfy Equation (7). Thisis because shortening the thickness of each lens element is needed for ashortened length of the optical imaging lens. When Equation (7) issatisfied, T4 and T5 are shortened properly. Additionally, the value ofALT/(CT4+CT5) is suggested for an upper limit, such as3.10≦ALT/(CT4+CT5)≦5.00.

Reference is now made to Equation (8). The value of AAG/(AC23+AC34+AC45)is preferable greater than or equal to 1.50 to satisfy Equation (8).This is because the air gaps between two adjacent lens elements would beshortened more and more for seeking a shortened length of the opticalimaging lens. When Equation (8) is satisfied, AC23, AC34 and AC45 areshortened properly. Additionally, the value of AAG/(AC23+AC34+AC45) issuggested for an upper limit, such as 1.50≦AAG/(AC23+AC34+AC45)≦3.50.

Reference is now made to Equation (9). The value of ALT/CT1 ispreferable greater than or equal to 4.20 to satisfy Equation (9). Thisis because the thickness of each lens element would be shortened moreand more for seeking a shortened length of the optical imaging lens.When Equation (9) is satisfied, CT1 is shortened properly to ensuredthat the length of the optical imaging lens is shortened effectively.Additionally, the value of ALT/CT1 is suggested for an upper limit, suchas 4.20≦ALT/CT1≦6.50.

Reference is now made to Equation (10). The value ofAC12/(AC23+AC34+AC45) is preferable greater than or equal to 1.00 tosatisfy Equation (10). This is because the air gaps between two adjacentlens elements would be shortened more and more for seeking a shortenedlength of the optical imaging lens and the lower limit is defined inlight of the manufacturing difficulty and optical path. When Equation(10) is satisfied, AC12, AC23, AC34 and AC45 are shortened properly.Additionally, the value of AC12/(AC23+AC34+AC45) is suggested for anupper limit, such as 1.00≦AC12/(AC23+AC34+AC45)≦2.50.

Reference is now made to Equation (11). The value of (ALT+AAG)/CT3 ispreferable less than or equal to 3.40 to satisfy Equation (11). This isbecause shortening the thickness of the third lens element havingpositive refracting power is not as easy as that of the lens elementrequiring having negative refracting power. Therefore, controlling(ALT+AAG)/CT3 is effective for reflecting how the thickness of theoptical imaging lens is shortened. When Equation (11) is satisfied, thethickness of the optical imaging lens is shortened effectively.Additionally, the value of (ALT+AAG)/CT3 is suggested for an upperlimit, such as 2.50≦(ALT+AAG)/CT3≦3.40.

When implementing example embodiments, more details about the convex orconcave surface structure and/or the refracting power may beincorporated for one specific lens element or broadly for plural lenselements to enhance the control for the system performance and/orresolution, as illustrated in the following embodiments. For example,the image-side surface of the first lens element further comprises aconcave portion in a vicinity of the optical axis, etc. It is noted thatthe details listed here could be incorporated in example embodiments ifno inconsistency occurs.

Several exemplary embodiments and associated optical data will now beprovided for illustrating example embodiments of optical imaging lenswith good optical characters and a shortened length. Reference is nowmade to FIGS. 2-5. FIG. 2 illustrates an example cross-sectional view ofan optical imaging lens 1 having five lens elements of the opticalimaging lens according to a first example embodiment. FIG. 3 showsexample charts of longitudinal spherical aberration and other kinds ofoptical aberrations of the optical imaging lens 1 according to anexample embodiment. FIG. 4 illustrates an example table of optical dataof each lens element of the optical imaging lens 1 according to anexample embodiment. FIG. 5 depicts an example table of aspherical dataof the optical imaging lens 1 according to an example embodiment.

As shown in FIG. 2, the optical imaging lens 1 of the present embodimentcomprises, in order from an object side A1 to an image side A2 along anoptical axis, an aperture stop 100, a first lens element 110, a secondlens element 120, a third lens element 130, a fourth lens element 140and a fifth lens element 150. A filtering unit 160 and an image plane170 of an image sensor are positioned at the image side A2 of theoptical lens 1. Each of the first, second, third, fourth, fifth lenselements 110, 120, 130, 140, 150 and the filtering unit 160 comprises anobject-side surface 111/121/131/141/151/161 facing toward the objectside A1 and an image-side surface 112/122/132/142/152/162 facing towardthe image side A2. The example embodiment of the filtering unit 160illustrated is an IR cut filter (infrared cut filter) positioned betweenthe fifth lens element 150 and an image plane 170. The filtering unit160 selectively absorbs light with specific wavelength from the lightpassing optical imaging lens 1. For example, IR light is absorbed, andthis will prohibit the IR light which is not seen by human eyes fromproducing an image on the image plane 170.

Exemplary embodiments of each lens element of the optical imaging lens 1which may be constructed by plastic material will now be described withreference to the drawings.

An example embodiment of the first lens element 110 may have positiverefracting power. The object-side surface 111 and image-side surface 112are convex surfaces. The image-side surface 112 comprises a convexportion 1122 in a vicinity of a periphery of the first lens element 110.

An example embodiment of the second lens element 120 may have negativerefracting power. The object-side surface 121 is a concave surfacecomprising a concave portion 1212 in a vicinity of a periphery of thesecond lens element 120. The image-side surface 122 is a convex surface.

An example embodiment of the third lens element 130 may have positiverefracting power. The object-side surface 131 is a concave surface andthe image-side surface 132 is a convex surface.

An example embodiment of the fourth lens element 140 may have negativerefracting power. The object-side surface 141 is a concave surface, andthe image-side surface 142 is a convex surface.

An example embodiment of the fifth lens element 150 may have negativerefracting power. The object-side surface 151 comprises a convex portion1511 in a vicinity of the optical axis, a convex portion 1512 in avicinity of a periphery of the fifth lens element 150 and a concaveportion 1513 between the vicinity of the optical axis and the vicinityof the periphery of the fifth lens element 150. The image-side surface152 comprises a concave portion 1521 in a vicinity of the optical axisand a convex portion 1522 in a vicinity of a periphery of the fifth lenselement 150.

In example embodiments, air gaps exist between the lens elements 110,120, 130, 140, 150, the filtering unit 160 and the image plane 170 ofthe image sensor. For example, FIG. 1 illustrates the air gap d1existing between the first lens element 110 and the second lens element120, the air gap d2 existing between the second lens element 120 and thethird lens element 130, the air gap d3 existing between the third lenselement 130 and the fourth lens element 140, the air gap d4 existingbetween the fourth lens element 140 and the fifth lens element 150, theair gap d5 existing between the fifth lens element 150 and the filteringunit 160, and the air gap d6 existing between the filtering unit 160 andthe image plane 170 of the image sensor. However, in other embodiments,any of the aforesaid air gaps may or may not exist. For example, theprofiles of opposite surfaces of any two adjacent lens elements maycorrespond to each other, and in such situation, the air gap may notexist. The air gap d1 is denoted by AC12, the air gap d3 is denoted byAC34, and the sum of all air gaps d1, d2, d3 and d4 between the firstand fifth lens elements 110, 150 is denoted by AAG.

FIG. 4 depicts the optical characters of each lens elements in theoptical imaging lens 1 of the present embodiment, wherein the values ofALT/CT3, AAG/AC12, CT1/CT2, CT5/CT2, ALT/CT4, (ALT+AAG)/CT5,ALT/(CT4+CT5), AAG/(AC23+AC34+AC45), ALT/CT1, AC12/(AC23+AC34+AC45) and(ALT+AAG)/CT3 are:

ALT/CT3=2.63, satisfying equation (1);

AAG/AC12=1.63, satisfying equation (2), (2′);

CT1/CT2=1.69, satisfying equation (3);

CT5/CT2=1.31, satisfying equation (4);

ALT/CT4=5.92, satisfying equation (5);

(ALT+AAG)/CT5=8.49, satisfying equation (6);

ALT/(CT4+CT5)=3.16, satisfying equation (7);

AAG/(AC23+AC34+AC45)=2.58, satisfying equation (8);

ALT/CT1=5.26, satisfying equation (9);

AC12/(AC23+AC34+AC45)=1.58, satisfying equation (10);

(ALT+AAG)/CT3=3.29, satisfying equation (11);

wherein the distance from the object-side surface 111 of the first lenselement 110 to the image plane 170 along the optical axis is 4.54 (mm),and the length of the optical imaging lens 1 is shortened.

The aspherical surfaces, including the object-side surface 111 and theimage-side surface 112 of the first lens element 110, the object-sidesurface 121 and the image-side surface 122 of the second lens element120, the object-side surface 131 and the image-side surface 132 of thethird lens element 130, the object-side surface 141 and the image-sidesurface 142 of the fourth lens element 140, and the object-side surface151 and the image-side surface 152 of the fifth lens element 150 are alldefined by the following aspherical formula:

${Z(Y)} = {{\frac{Y^{2}}{R}/\left( {1 + \sqrt{1 - {\left( {1 + K} \right)\frac{Y^{2}}{R^{2}}}}} \right)} + {\sum\limits_{i = 1}^{n}{a_{2i} \times Y^{2i}}}}$

wherein,

R represents the radius of curvature of the surface of the lens element;

Z represents the depth of the aspherical surface (the perpendiculardistance between the point of the aspherical surface at a distance Yfrom the optical axis and the tangent plane of the vertex on the opticalaxis of the aspherical surface);

Y represents the perpendicular distance between the point of theaspherical surface and the optical axis;

K represents a conic constant;

a_(2i) represents an aspherical coefficient of 2i^(th) level.

The values of each aspherical parameter are shown in FIG. 5.

As illustrated in FIG. 3, longitudinal spherical aberration (a), thecurves of different wavelengths are closed to each other. Thisrepresents off-axis light with respect to these wavelengths is focusedaround an image point. From the vertical deviation of each curve showntherein, the offset of the off-axis light relative to the image point iswithin ±0.02 (mm). Therefore, the present embodiment improves thelongitudinal spherical aberration with respect to different wavelengths.

Please refer to FIG. 3, astigmatism aberration in the sagittal direction(b) and astigmatism aberration in the tangential direction (c). Thefocus variation with respect to the three wavelengths in the whole fieldfalls within ±0.20 (mm). This reflects the optical imaging lens 1 of thepresent embodiment eliminates aberration effectively. Additionally, theclosed curves represents dispersion is improved.

Please refer to FIG. 3, distortion aberration (d), which showing thevariation of the distortion aberration is within ±2%. Such distortionaberration meets the requirement of acceptable image quality and showsthe optical imaging lens 1 of the present embodiment could restrict thedistortion aberration to raise the image quality even though the lengthof the optical imaging lens 1 is shortened to less than 4.54 mm.

Therefore, the optical imaging lens 1 of the present embodiment showsgreat characteristics in the longitudinal spherical aberration,astigmatism in the sagittal direction, astigmatism in the tangentialdirection, and distortion aberration. According to above illustration,the optical imaging lens 1 of the example embodiment indeed achievesgreat optical performance and the length of the optical imaging lens 1is effectively shortened.

Reference is now made to FIGS. 6-9. FIG. 6 illustrates an examplecross-sectional view of an optical imaging lens 2 having five lenselements of the optical imaging lens according to a second exampleembodiment. FIG. 7 shows example charts of longitudinal sphericalaberration and other kinds of optical aberrations of the optical imaginglens 2 according to the second example embodiment. FIG. 8 shows anexample table of optical data of each lens element of the opticalimaging lens 2 according to the second example embodiment. FIG. 9 showsan example table of aspherical data of the optical imaging lens 2according to the second example embodiment. The reference numberslabeled in the present embodiment are similar to those in the firstembodiment for the similar elements, but here the reference numbers areinitialed with 2, for example, reference number 231 for labeling theobject-side surface of the third lens element 230, reference number 232for labeling the image-side surface of the third lens element 230, etc.

As shown in FIG. 6, the optical imaging lens 2 of the presentembodiment, in an order from an object side A1 to an image side A2 alongan optical axis, comprises an aperture stop 200, the first lens element210, a second lens element 220, a third lens element 230, a fourth lenselement 240 and a fifth lens element 250.

The differences between the second embodiment and the first embodimentare the radius of curvature and thickness of each lens element, thedistance of each air gap and the surface shape of the second lenselement 220 and the fifth lens element 250, but the refracting power andconfiguration of the concave/convex shape of the lens elements(comprising the object-side surfaces 211, 221, 231, 241 facing to theobject side A1 and the image-side surfaces 212, 232, 242, 252 facing tothe image side A2) are similar to those in the first embodiment.Specifically, the image-side surface 222 of the second lens element 220comprises a concave portion 2221 in a vicinity of the optical axis and aconvex portion 2222 in a vicinity of a periphery of the second lenselement 220, and the object-side surface 251 of the fifth lens element250 comprises a concave portion 2512 in a vicinity of a periphery of thefifth lens element 250. Please refer to FIG. 8 for the opticalcharacteristics of each lens elements in the optical imaging lens 2 ofthe present embodiment, wherein the values of ALT/CT3, AAG/AC12,CT1/CT2, CT5/CT2, ALT/CT4, (ALT+AAG)/CT5, ALT/(CT4+CT5),AAG/(AC23+AC34+AC45), ALT/CT1, AC12/(AC23+AC34+AC45) and (ALT+AAG)/CT3are:

ALT/CT3=2.65, satisfying equation (1);

AAG/AC12=1.67, satisfying equation (2), (2′);

CT1/CT2=1.99, satisfying equation (3);

CT5/CT2=1.37, satisfying equation (4);

ALT/CT4=6.58, satisfying equation (5);

(ALT+AAG)/CT5=8.45, satisfying equation (6);

ALT/(CT4+CT5)=3.33, satisfying equation (7);

AAG/(AC23+AC34+AC45)=2.50, satisfying equation (8);

ALT/CT1=4.66, satisfying equation (9);

AC12/(AC23+AC34+AC45)=1.50, satisfying equation (10);

(ALT+AAG)/CT3=3.31, satisfying equation (11);

wherein the distance from the object-side surface 211 of the first lenselement 210 to the image plane 270 along the optical axis is 4.55 (mm)and the length of the optical imaging lens 2 is shortened.

As shown in FIG. 7, the optical imaging lens 2 of the present embodimentshows great characteristics in longitudinal spherical aberration (a),astigmatism in the sagittal direction (b), astigmatism in the tangentialdirection (c), and distortion aberration (d). Therefore, according tothe above illustration, the optical imaging lens of the presentembodiment indeed shows great optical performance and the length of theoptical imaging lens 2 is effectively shortened.

Reference is now made to FIGS. 10-13. FIG. 10 illustrates an examplecross-sectional view of an optical imaging lens 3 having five lenselements of the optical imaging lens according to a third exampleembodiment. FIG. 11 shows example charts of longitudinal sphericalaberration and other kinds of optical aberrations of the optical imaginglens 3 according to the third example embodiment. FIG. 12 shows anexample table of optical data of each lens element of the opticalimaging lens 3 according to the third example embodiment. FIG. 13 showsan example table of aspherical data of the optical imaging lens 3according to the third example embodiment. The reference numbers labeledin the present embodiment are similar to those in the first embodimentfor the similar elements, but here the reference numbers are initialedwith 3, for example, reference number 331 for labeling the object-sidesurface of the third lens element 330, reference number 332 for labelingthe image-side surface of the third lens element 330, etc.

As shown in FIG. 10, the optical imaging lens 3 of the presentembodiment, in an order from an object side A1 to an image side A2 alongan optical axis, comprises an aperture stop 300, the first lens element310, a second lens element 320, a third lens element 330, a fourth lenselement 340 and a fifth lens element 350.

The differences between the third embodiment and the first embodimentare the radius of curvature and thickness of each lens element, thedistance of each air gap and the surface shape of the first lens element310 and fifth lens element 350, but the refracting power andconfiguration of the concave/convex shape of the lens elements(comprising the object-side surfaces 311, 321, 331, 341 facing to theobject side A1 and the image-side surfaces 322, 332, 342, 352 facing tothe image side A2) are similar to those in the first embodiment.Specifically, the image-side surface 312 of the first lens element 310comprises a concave portion 3121 in a vicinity of the optical axis and aconvex portion 3122 in a vicinity of a periphery of the first lenselement 310, and the object-side surface 351 of the fifth lens element350 comprises a concave portion 3512 in a vicinity of a periphery of thefifth lens element 350. Please refer to FIG. 12 for the opticalcharacteristics of each lens elements in the optical imaging lens 3 ofthe present embodiment, wherein the values of ALT/CT3, AAG/AC12,CT1/CT2, CT5/CT2, ALT/CT4, (ALT+AAG)/CT5, ALT/(CT4+CT5),AAG/(AC23+AC34+AC45), ALT/CT1, AC12/(AC23+AC34+AC45) and (ALT+AAG)/CT3are:

ALT/CT3=2.62, satisfying equation (1);

AAG/AC12=1.63, satisfying equation (2), (2′);

CT1/CT2=1.03, satisfying equation (3);

CT5/CT2=0.95, satisfying equation (4);

ALT/CT4=6.56, satisfying equation (5);

(ALT+AAG)/CT5=8.42, satisfying equation (6);

ALT/(CT4+CT5)=3.32, satisfying equation (7);

AAG/(AC23+AC34+AC45)=2.59, satisfying equation (8);

ALT/CT1=6.22, satisfying equation (9);

AC12/(AC23+AC34+AC45)=1.59, satisfying equation (10);

(ALT+AAG)/CT3=3.29, satisfying equation (11);

wherein the distance from the object-side surface 311 of the first lenselement 310 to the image plane 370 along the optical axis is 4.56 (mm)and the length of the optical imaging lens 3 is shortened.

As shown in FIG. 11, the optical imaging lens 3 of the presentembodiment shows great characteristics in longitudinal sphericalaberration (a), astigmatism in the sagittal direction (b), astigmatismin the tangential direction (c), and distortion aberration (d).Therefore, according to the above illustration, the optical imaging lensof the present embodiment indeed shows great optical performance and thelength of the optical imaging lens 3 is effectively shortened.

Reference is now made to FIGS. 14-17. FIG. 14 illustrates an examplecross-sectional view of an optical imaging lens 4 having five lenselements of the optical imaging lens according to a fourth exampleembodiment. FIG. 15 shows example charts of longitudinal sphericalaberration and other kinds of optical aberrations of the optical imaginglens 4 according to the fourth embodiment. FIG. 16 shows an exampletable of optical data of each lens element of the optical imaging lens 4according to the fourth example embodiment. FIG. 17 shows an exampletable of aspherical data of the optical imaging lens 4 according to thefourth example embodiment. The reference numbers labeled in the presentembodiment are similar to those in the first embodiment for the similarelements, but here the reference numbers are initialed with 4, forexample, reference number 431 for labeling the object-side surface ofthe third lens element 430, reference number 432 for labeling theimage-side surface of the third lens element 430, etc.

As shown in FIG. 14, the optical imaging lens 4 of the presentembodiment, in an order from an object side A1 to an image side A2 alongan optical axis, comprises an aperture stop 400, the first lens element410, a second lens element 420, a third lens element 430, a fourth lenselement 440 and a fifth lens element 450.

The differences between the fourth embodiment and the first embodimentare the radius of curvature and thickness of each lens element, thedistance of each air gap and the surface shape of the first lens element410 and fifth lens element 450, but the refracting power andconfiguration of the concave/convex shape of the lens elements(comprising the object-side surfaces 411, 421, 431, 441 facing to theobject side A1 and the image-side surfaces 422, 432, 442, 452 facing tothe image side A2) are similar to those in the first embodiment.Specifically, the image-side surface 412 of the first lens element 410comprises a concave portion 4121 in a vicinity of the optical axis and aconvex portion 4122 in a vicinity of a periphery of the first lenselement 410, and the object-side surface 451 of the fifth lens element450 comprises a concave portion 4512 in a vicinity of a periphery of thefifth lens element 450. Please refer to FIG. 16 for the opticalcharacteristics of each lens elements in the optical imaging lens 4 ofthe present embodiment, wherein the values of ALT/CT3, AAG/AC12,CT1/CT2, CT5/CT2, ALT/CT4, (ALT+AAG)/CT5, ALT/(CT4+CT5),AAG/(AC23+AC34+AC45), ALT/CT1, AC12/(AC23+AC34+AC45) and (ALT+AAG)/CT3are:

ALT/CT3=2.61, satisfying equation (1);

AAG/AC12=1.99, satisfying equation (2), (2′);

CT1/CT2=1.01, satisfying equation (3);

CT5/CT2=0.91, satisfying equation (4);

ALT/CT4=7.06, satisfying equation (5);

(ALT+AAG)/CT5=8.74, satisfying equation (6);

ALT/(CT4+CT5)=3.44, satisfying equation (7);

AAG/(AC23+AC34+AC45)=2.01, satisfying equation (8);

ALT/CT1=6.09, satisfying equation (9);

AC12/(AC23+AC34+AC45)=1.01, satisfying equation (10);

(ALT+AAG)/CT3=3.40, satisfying equation (11);

wherein the distance from the object-side surface 411 of the first lenselement 410 to the image plane 470 along the optical axis is 4.51 (mm)and the length of the optical imaging lens 4 is shortened.

As shown in FIG. 15, the optical imaging lens 4 of the presentembodiment shows great characteristics in longitudinal sphericalaberration (a), astigmatism in the sagittal direction (b), astigmatismin the tangential direction (c), and distortion aberration (d).Therefore, according to the above illustration, the optical imaging lensof the present embodiment indeed shows great optical performance and thelength of the optical imaging lens 4 is effectively shortened.

Reference is now made to FIGS. 18-21. FIG. 18 illustrates an examplecross-sectional view of an optical imaging lens 5 having five lenselements of the optical imaging lens according to a fifth exampleembodiment. FIG. 19 shows example charts of longitudinal sphericalaberration and other kinds of optical aberrations of the optical imaginglens 5 according to the fifth embodiment. FIG. 20 shows an example tableof optical data of each lens element of the optical imaging lens 5according to the fifth example embodiment. FIG. 21 shows an exampletable of aspherical data of the optical imaging lens 5 according to thefifth example embodiment. The reference numbers labeled in the presentembodiment are similar to those in the first embodiment for the similarelements, but here the reference numbers are initialed with 5, forexample, reference number 531 for labeling the object-side surface ofthe third lens element 530, reference number 532 for labeling theimage-side surface of the third lens element 530, etc.

As shown in FIG. 18, the optical imaging lens 5 of the presentembodiment, in an order from an object side A1 to an image side A2 alongan optical axis, comprises an aperture stop 500, the first lens element510, a second lens element 520, a third lens element 530, a fourth lenselement 540 and a fifth lens element 550.

The differences between the fifth embodiment and the first embodimentare the radius of curvature and thickness of each lens element, thedistance of each air gap and the surface shape of the fifth lens element550, but the refracting power and configuration of the concave/convexshape of the lens elements (comprising the object-side surfaces 511,521, 531, 541 facing to the object side A1 and the image-side surfaces512, 522, 532, 542, 552 facing to the image side A2) are similar tothose in the first embodiment. Specifically, the object-side surface 551of the fifth lens element 550 comprises a concave portion 5512 in avicinity of a periphery of the fifth lens element 550. Please refer toFIG. 20 for the optical characteristics of each lens elements in theoptical imaging lens 5 of the present embodiment, wherein the values ofALT/CT3, AAG/AC12, CT1/CT2, CT5/CT2, ALT/CT4, (ALT+AAG)/CT5,ALT/(CT4+CT5), AAG/(AC23+AC34+AC45), ALT/CT1, AC12/(AC23+AC34+AC45) and(ALT+AAG)/CT3 are:

ALT/CT3=2.70, satisfying equation (1);

AAG/AC12=1.46, satisfying equation (2), (2′);

CT1/CT2=1.62, satisfying equation (3);

CT5/CT2=1.43, satisfying equation (4);

ALT/CT4=5.67, satisfying equation (5);

(ALT+AAG)/CT5=8.24, satisfying equation (6);

ALT/(CT4+CT5)=2.97;

AAG/(AC23+AC34+AC45)=3.18, satisfying equation (8);

ALT/CT1=5.52, satisfying equation (9);

AC12/(AC23+AC34+AC45)=2.18, satisfying equation (10);

(ALT+AAG)/CT3=3.55;

wherein the distance from the object-side surface 511 of the first lenselement 510 to the image plane 570 along the optical axis is 4.41 (mm)and the length of the optical imaging lens 5 is shortened.

As shown in FIG. 19, the optical imaging lens 5 of the presentembodiment shows great characteristics in longitudinal sphericalaberration (a), astigmatism in the sagittal direction (b), astigmatismin the tangential direction (c), and distortion aberration (d).Therefore, according to the above illustration, the optical imaging lensof the present embodiment indeed shows great optical performance and thelength of the optical imaging lens 5 is effectively shortened.

Reference is now made to FIGS. 22-25. FIG. 22 illustrates an examplecross-sectional view of an optical imaging lens 6 having five lenselements of the optical imaging lens according to a sixth exampleembodiment. FIG. 23 shows example charts of longitudinal sphericalaberration and other kinds of optical aberrations of the optical imaginglens 6 according to the sixth embodiment. FIG. 24 shows an example tableof optical data of each lens element of the optical imaging lens 6according to the sixth example embodiment. FIG. 25 shows an exampletable of aspherical data of the optical imaging lens 6 according to thesixth example embodiment. The reference numbers labeled in the presentembodiment are similar to those in the first embodiment for the similarelements, but here the reference numbers are initialed with 6, forexample, reference number 631 for labeling the object-side surface ofthe third lens element 630, reference number 632 for labeling theimage-side surface of the third lens element 630, etc.

As shown in FIG. 22, the optical imaging lens 6 of the presentembodiment, in an order from an object side A1 to an image side A2 alongan optical axis, comprises an aperture stop 600, the first lens element610, a second lens element 620, a third lens element 630, a fourth lenselement 640 and a fifth lens element 650.

The differences between the sixth embodiment and the first embodimentare the radius of curvature and thickness of each lens element, thedistance of each air gap and the surface shape of the second lenselement 620, but the refracting power and configuration of theconcave/convex shape of the lens elements (comprising the object-sidesurfaces 611, 621, 631, 641, 651 facing to the object side A1 and theimage-side surfaces 612, 632, 642, 652 facing to the image side A2) aresimilar to those in the first embodiment. Specifically, the image-sidesurface 622 of the second lens element 620 comprises a convex portion6221 in a vicinity of the optical axis, a convex portion 6222 in avicinity of a periphery of the second lens element 620 and a concaveportion 6223 between the vicinity of the optical axis and the vicinityof the periphery of the second lens element 620. Please refer to FIG. 24for the optical characteristics of each lens elements in the opticalimaging lens 6 of the present embodiment, wherein the values of ALT/CT3,AAG/AC12, CT1/CT2, CT5/CT2, ALT/CT4, (ALT+AAG)/CT5, ALT/(CT4+CT5),AAG/(AC23+AC34+AC45), ALT/CT1, AC12/(AC23+AC34+AC45) and (ALT+AAG)/CT3are:

ALT/CT3=2.40, satisfying equation (1);

AAG/AC12=5.94, satisfying equation (2);

CT1/CT2=1.99, satisfying equation (3);

CT5/CT2=1.37, satisfying equation (4);

ALT/CT4=7.12, satisfying equation (5);

(ALT+AAG)/CT5=8.77, satisfying equation (6);

ALT/(CT4+CT5)=3.74, satisfying equation (7);

AAG/(AC23+AC34+AC45)=1.20;

ALT/CT1=4.76, satisfying equation (9);

AC12/(AC23+AC34+AC45)=0.20;

(ALT+AAG)/CT3=3.03, satisfying equation (11);

wherein the distance from the object-side surface 611 of the first lenselement 610 to the image plane 670 along the optical axis is 4.20 (mm)and the length of the optical imaging lens 6 is shortened.

As shown in FIG. 23, the optical imaging lens 6 of the presentembodiment shows great characteristics in longitudinal sphericalaberration (a), astigmatism in the sagittal direction (b), astigmatismin the tangential direction (c), and distortion aberration (d).Therefore, according to the above illustration, the optical imaging lensof the present embodiment indeed shows great optical performance and thelength of the optical imaging lens 6 is effectively shortened.

Reference is now made to FIGS. 26-29. FIG. 26 illustrates an examplecross-sectional view of an optical imaging lens 7 having five lenselements of the optical imaging lens according to a seventh exampleembodiment. FIG. 27 shows example charts of longitudinal sphericalaberration and other kinds of optical aberrations of the optical imaginglens 7 according to the seventh embodiment. FIG. 28 shows an exampletable of optical data of each lens element of the optical imaging lens 7according to the seventh example embodiment. FIG. 29 shows an exampletable of aspherical data of the optical imaging lens 7 according to theseventh example embodiment. The reference numbers labeled in the presentembodiment are similar to those in the first embodiment for the similarelements, but here the reference numbers are initialed with 7, forexample, reference number 731 for labeling the object-side surface ofthe third lens element 730, reference number 732 for labeling theimage-side surface of the third lens element 730, etc.

As shown in FIG. 26, the optical imaging lens 7 of the presentembodiment, in an order from an object side A1 to an image side A2 alongan optical axis, comprises an aperture stop 700, the first lens element710, a second lens element 720, a third lens element 730, a fourth lenselement 740 and a fifth lens element 750.

The differences between the seventh embodiment and the first embodimentare the radius of curvature and thickness of each lens element, thedistance of each air gap and the surface shape of the second lenselement 720 and fifth lens element 750, but the refracting power andconfiguration of the concave/convex shape of the lens elements(comprising the object-side surfaces 711, 721, 731, 741 facing to theobject side A1 and the image-side surfaces 712, 732, 742, 752 facing tothe image side A2) are similar to those in the first embodiment.Specifically, the image-side surface 722 of the second lens element 720comprises a concave portion 7221 in a vicinity of the optical axis and aconvex portion 7222 in a vicinity of a periphery of the second lenselement 720 and the object-side surface 751 of the fifth lens element750 comprises a concave portion 7512 in a vicinity of a periphery of thefifth lens element 750. Please refer to FIG. 28 for the opticalcharacteristics of each lens elements in the optical imaging lens 7 ofthe present embodiment, wherein the values of ALT/CT3, AAG/AC12,CT1/CT2, CT5/CT2, ALT/CT4, (ALT+AAG)/CT5, ALT/(CT4+CT5),AAG/(AC23+AC34+AC45), ALT/CT1, AC12/(AC23+AC34+AC45) and (ALT+AAG)/CT3are:

ALT/CT3=4.70, satisfying equation (1);

AAG/AC12=2.20, satisfying equation (2), (2′);

CT1/CT2=2.00, satisfying equation (3);

CT5/CT2=1.25, satisfying equation (4);

ALT/CT4=4.84;

(ALT+AAG)/CT5=7.25, satisfying equation (6);

ALT/(CT4+CT5)=2.65;

AAG/(AC23+AC34+AC45)=1.84, satisfying equation (8);

ALT/CT1=3.66;

AC12/(AC23+AC34+AC45)=0.84;

(ALT+AAG)/CT3=5.80;

wherein the distance from the object-side surface 711 of the first lenselement 710 to the image plane 770 along the optical axis is 4.58 (mm)and the length of the optical imaging lens 7 is shortened.

As shown in FIG. 27, the optical imaging lens 7 of the presentembodiment shows great characteristics in longitudinal sphericalaberration (a), astigmatism in the sagittal direction (b), astigmatismin the tangential direction (c), and distortion aberration (d).Therefore, according to the above illustration, the optical imaging lensof the present embodiment indeed shows great optical performance and thelength of the optical imaging lens 7 is effectively shortened.

Please refer to FIG. 30, which shows the values of ALT/CT3, AAG/AC12,CT1/CT2, CT5/CT2, ALT/CT4, (ALT+AAG)/CT5, ALT/(CT4+CT5),AAG/(AC23+AC34+AC45), ALT/CT1, AC12/(AC23+AC34+AC45) and (ALT+AAG)/CT3of all seven embodiments, and it is clear that the optical imaging lensof the present invention satisfy the Equations (1), (2) and/or (2′),(3), (4), (5), (6), (7), (8), (9), (10) and/or (11).

Reference is now made to FIG. 31, which illustrates an examplestructural view of a first embodiment of mobile device 20 applying anaforesaid optical imaging lens. The mobile device 20 comprises a housing21 and a photography module 22 positioned in the housing 21. An exampleof the mobile device 20 may be, but is not limited to, a mobile phone.

As shown in FIG. 31, the photography module 22 may comprise an aforesaidoptical imaging lens with five lens elements, for example the opticalimaging lens 1 of the first embodiment, a lens barrel 23 for positioningthe optical imaging lens 1, a module housing unit 24 for positioning thelens barrel 23, a substrate 172 for positioning the module housing unit24, and an image sensor 171 which is positioned at an image side of theoptical imaging lens 1. The image plane 170 is formed on the imagesensor 171.

In some other example embodiments, the structure of the filtering unit160 may be omitted. In some example embodiments, the housing 21, thelens barrel 23, and/or the module housing unit 24 may be integrated intoa single component or assembled by multiple components. In some exampleembodiments, the image sensor 171 used in the present embodiment isdirectly attached to a substrate 172 in the form of a chip on board(COB) package, and such package is different from traditional chip scalepackages (CSP) since COB package does not require a cover glass beforethe image sensor 171 in the optical imaging lens 1. Aforesaid exemplaryembodiments are not limited to this package type and could beselectively incorporated in other described embodiments.

The five lens elements 110, 120, 130, 140, 150 are positioned in thelens barrel 23 in the way of separated by an air gap between any twoadjacent lens elements.

The module housing unit 24 comprises a lens backseat 2401 forpositioning the lens barrel 23 and an image sensor base 2406 positionedbetween the lens backseat 2401 and the image sensor 171. The lens barrel23 and the lens backseat 2401 are positioned along a same axis I-I′, andthe lens backseat 2401 is close to the outside of the lens barrel 23.The image sensor base 2406 is exemplarily close to the lens backseat2401 here. The image sensor base 2406 could be optionally omitted insome other embodiments of the present invention.

Because the length of the optical imaging lens 1 is merely 4.54 (mm),the size of the mobile device 20 may be quite small. Therefore, theembodiments described herein meet the market demand for smaller sizedproduct designs.

Reference is now made to FIG. 32, which shows another structural view ofa second embodiment of mobile device 20′ applying the aforesaid opticalimaging lens 1. One difference between the mobile device 20′ and themobile device 20 may be the lens backseat 2401 comprising a first seatunit 2402, a second seat unit 2403, a coil 2404 and a magnetic unit2405. The first seat unit 2402 is close to the outside of the lensbarrel 23, and positioned along an axis I-I′, and the second seat unit2403 is around the outside of the first seat unit 2402 and positionedalong with the axis I-I′. The coil 2404 is positioned between the firstseat unit 2402 and the inside of the second seat unit 2403. The magneticunit 2405 is positioned between the outside of the coil 2404 and theinside of the second seat unit 2403.

The lens barrel 23 and the optical imaging lens 1 positioned therein aredriven by the first seat unit 2402 for moving along the axis I-I′. Therest structure of the mobile device 20′ is similar to the mobile device20.

Similarly, because the length of the optical imaging lens 1, 4.54 (mm),is shortened, the mobile device 20′ may be designed with a smaller sizeand meanwhile good optical performance is still provided. Therefore, thepresent embodiment meets the demand of small sized product design andthe request of the market.

According to above illustration, it is clear that the mobile device andthe optical imaging lens thereof in example embodiments, throughcontrolling the detail structure and/or reflection power of the lenselements, the length of the optical imaging lens is effectivelyshortened and meanwhile good optical characters are still provided.

While various embodiments in accordance with the disclosed principlesbeen described above, it should be understood that they are presented byway of example only, and are not limiting. Thus, the breadth and scopeof exemplary embodiment(s) should not be limited by any of theabove-described embodiments, but should be defined only in accordancewith the claims and their equivalents issuing from this disclosure.Furthermore, the above advantages and features are provided in describedembodiments, but shall not limit the application of such issued claimsto processes and structures accomplishing any or all of the aboveadvantages.

Additionally, the section headings herein are provided for consistencywith the suggestions under 37 C.F.R. 1.77 or otherwise to provideorganizational cues. These headings shall not limit or characterize theinvention(s) set out in any claims that may issue from this disclosure.Specifically, a description of a technology in the “Background” is notto be construed as an admission that technology is prior art to anyinvention(s) in this disclosure. Furthermore, any reference in thisdisclosure to “invention” in the singular should not be used to arguethat there is only a single point of novelty in this disclosure.Multiple inventions may be set forth according to the limitations of themultiple claims issuing from this disclosure, and such claimsaccordingly define the invention(s), and their equivalents, that areprotected thereby. In all instances, the scope of such claims shall beconsidered on their own merits in light of this disclosure, but shouldnot be constrained by the headings herein.

What is claimed is:
 1. An optical imaging lens, sequencially from anobject side to an image side along an optical axis, comprising anaperture stop, first, second, third, fourth and fifth lens elements,each of said first, second, third, fourth and fifth lens elements havingan object-side surface facing toward the object side and an image-sidesurface facing toward the image side, wherein: said first lens elementhas positive refracting power, and said image-side surface thereofcomprises a convex portion in a vicinity of a periphery of the firstlens element; said object-side surface of said second lens elementcomprises a concave portion in a vicinity of a periphery of the secondlens element; said third lens element has positive refracting power, andsaid object-side surface of said third lens element comprises a concaveportion in a vicinity of the optical axis, and said image-side surfaceof said third lens element is a convex surface; said object-side surfaceof said fourth lens element comprises a concave portion in a vicinity ofa periphery of the fourth lens element; said fifth lens element isconstructed by plastic material, said object-side surface of said fifthlens element comprises a convex portion in a vicinity of the opticalaxis; and the optical imaging lens as a whole comprises only the fivelens elements having refracting power.
 2. The optical imaging lensaccording to claim 1, wherein the sum of the thickness of all five lenselements along the optical axis is ALT, a central thickness of the thirdlens element along the optical axis is CT3, and ALT and CT3 satisfy theequation:ALT/CT3≦5.10
 3. The optical imaging lens according to claim 2, whereinan air gap between the first lens element and the second lens elementalong the optical axis is AC12, the sum of all four air gaps from thefirst lens element to the fifth lens element along the optical axis isAAG, and AC12 and AAG satisfy the equation:AAG/AC12≦6.00.
 4. The optical imaging lens according to claim 3, whereina central thickness of the first lens element along the optical axis isCT1, a central thickness of the second lens element along the opticalaxis is CT2, and CT1 and CT2 satisfy the equation:CT1/CT2≦2.00.
 5. The optical imaging lens according to claim 4, whereinALT and CT1 satisfy the equation:4.20≦ALT/CT1.
 6. The optical imaging lens according to claim 5, whereina central thickness of the fifth lens element along the optical axis isCT5, and CT2 and CT5 satisfy the equation:CT5/CT2≦1.50.
 7. The optical imaging lens according to claim 6, whereinan air gap between the second lens element and the third lens elementalong the optical axis is AC23, an air gap between the third lenselement and the fourth lens element along the optical axis is AC34, anair gap between the fourth lens element and the fifth lens element alongthe optical axis is AC45, and AC23, AC34, AC45 and AAG satisfy theequation:1.50≦AAG/(AC23+AC34+AC45).
 8. The optical imaging lens according toclaim 2, wherein a central thickness of the first lens element along theoptical axis is CT1, a central thickness of the second lens elementalong the optical axis is CT2, and CT1 and CT2 satisfy the equation:CT1/CT2≦2.00.
 9. The optical imaging lens according to claim 8, whereinthe sum of all four air gaps from the first lens element to the fifthlens element along the optical axis is AAG, a central thickness of thefifth lens element along the optical axis is CT5, and AAG, CT5 and ALTsatisfy the equation:7.00≦(ALT+AAG)/CT5.
 10. The optical imaging lens according to claim 9,wherein an air gap between the first lens element and the second lenselement along the optical axis is AC12, an air gap between the secondlens element and the third lens element along the optical axis is AC23,an air gap between the third lens element and the fourth lens elementalong the optical axis is AC34, an air gap between the fourth lenselement and the fifth lens element along the optical axis is AC45, andAC12, AC23, AC34 and AC45 satisfy the equation:1.00≦AC12/(AC23+AC34+AC45).
 11. The optical imaging lens according toclaim 1, wherein an air gap between the first lens element and thesecond lens element along the optical axis is AC12, the sum of all fourair gaps from the first lens element to the fifth lens element along theoptical axis is AAG, and AC12 and AAG satisfy the equation:AAG/AC12≦6.00.
 12. The optical imaging lens according to claim 11,wherein the sum of the thickness of all five lens elements along theoptical axis is ALT, a central thickness of the fourth lens elementalong the optical axis is CT4, and ALT and CT4 satisfy the equation:5.20≦ALT/CT4.
 13. The optical imaging lens according to claim 12,wherein a central thickness of the fifth lens element along the opticalaxis is CT5, and CT4, CT5 and ALT satisfy the equation:3.10≦ALT/(CT4+CT5).
 14. The optical imaging lens according to claim 13,wherein said image-side surface of said first lens element furthercomprises a concave portion in a vicinity of the optical axis.
 15. Theoptical imaging lens according to claim 1, wherein a central thicknessof the first lens element along the optical axis is CT1, a centralthickness of the second lens element along the optical axis is CT2, andCT1 and CT2 satisfy the equation:CT1/CT2≦2.00.
 16. The optical imaging lens according to claim 15,wherein an air gap between the first lens element and the second lenselement along the optical axis is AC12, the sum of all four air gapsfrom the first lens element to the fifth lens element along the opticalaxis is AAG, and AC12 and AAG satisfy the equation:AAG/AC12≦3.00.
 17. The optical imaging lens according to claim 16,wherein the sum of the thickness of all five lens elements along theoptical axis is ALT, a central thickness of the third lens element alongthe optical axis is CT3, and ALT, CT3 and AAG satisfy the equation:(ALT+AAG)/CT3≦3.40.
 18. A mobile device, comprising: a housing; and aphotography module positioned in the housing and comprising: the opticalimaging lens as claimed in claim 1; a lens barrel for positioning theoptical imaging lens; a module housing unit for positioning the lensbarrel; and an image sensor positioned at the image side of the opticalimaging lens.
 19. The mobile device according to claim 18, wherein themodule housing unit comprises a lens backseat comprising a first lensbackseat and a second lens backseat, the first lens backseat ispositioned close to the outside of the lens barrel and along with anaxis for driving the lens barrel and the optical imaging lens positionedtherein to move along the axis, and the second lens backseat ispositioned along the axis and around the outside of the first lensbackseat.
 20. The mobile device according to claim 19, wherein themodule housing unit further comprises an image sensor base positionedbetween the second lens backseat and the image sensor, and the imagesensor base is closed to the second lens backseat.